Dual 3-stage bypass motors for the superior performance needed for larger homes up to 12,000 square feet Dual-filtration system with disposable bags Large 8-gallon capacity 4 HP with 740 air watts 135 water lift capacity 240V - 15 amp power rating Reduced sound levels and system status lights Green Label approved for superior cleaning 13 1/4 diameter x 36 1/4 H